A used King 4B Sonorous trombone with F attachment. This is a professional large bore trombone that comes with a small shank adapter. The horn has lacquer loss, some scratches, a few dings, and no major dents. It has been professionally serviced earlier this year: slide aligned, chem’ cleaned, and rotor section regulated. The hand-slide is in very good working condition. It comes in the original case with a Bach 6 1/2 large shank mouthpiece and slide cream. The serial number 658xxx puts the manufacturing date around 1977-78.